Second Harmonic Suppression for Broadband Helix Traveling-Wave Tubes Using the Phase Velocity Variation of Output Circuit  

作　　者：ZHANG Jinling YANG Jinsheng ZHANG Hongxin 

机构地区：[1]School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China [2]Beijing Vacuum Electronics Research Institute, Beijing 100015, China

出　　处：《Chinese Journal of Electronics》2016年第3期577-582,共6页电子学报（英文版）

基　　金：supported by National Natural Science Foundation of China(No.61171051,No.60771060)

摘　　要：Based on the principle of phase velocity tapering or stepping output circuit, using the phase velocity variation of the output circuit, four kinds of nonuniform output circuit models have been presented in broadband helix Traveling-wave tubes(TWTs). Taking an example of6–18GHz, 100 W broadband helix TWT and using the improved one-dimensional large signal program, second harmonic suppression performances have been studied by calculating the quantitative relationship between fundamental efficiency, second harmonic output power, and the stepping(tapering) position and strength of phase velocity variation for the four kinds of nonuniform output circuits. From the research results of backward wave and second harmonic suppression feature in two kinds of nonuniform output circuits, we obtained the design principle of phase velocity stepping or tapering, which could suppress the Backward wave oscillation(BWO) and reduce the output power of second harmonic for broadband high-power helix TWTs.Based on the principle of phase velocity tapering or stepping output circuit, using the phase velocity variation of the output circuit, four kinds of nonuniform output circuit models have been presented in broadband helix Traveling-wave tubes（TWTs）. Taking an example of6–18GHz, 100 W broadband helix TWT and using the improved one-dimensional large signal program, second harmonic suppression performances have been studied by calculating the quantitative relationship between fundamental efficiency, second harmonic output power, and the stepping（tapering） position and strength of phase velocity variation for the four kinds of nonuniform output circuits. From the research results of backward wave and second harmonic suppression feature in two kinds of nonuniform output circuits, we obtained the design principle of phase velocity stepping or tapering, which could suppress the Backward wave oscillation（BWO） and reduce the output power of second harmonic for broadband high-power helix TWTs.

关 键 词：Backward wave suppression Fundamental efficiency Nonuniform circuits Second harmonic suppression Traveling-wave tube（TWT） 

分 类 号：TN124[电子电信—物理电子学] TN722.75